Question: Which chemical compound has the highest global-warming potential?
Paraphrase: what chemical has the highest global warming potential?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q11173 . ?ent wdt:P2565 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: sulfur hexafluoride, sulfur hexafluoride, sulfur hexafluoride, trifluoromethylsulfur pentafluoride, nitrogen trifluoride